MFBW1V2012-301-R - 300Ω Ferrite Bead, 0805, 2A | Eaton
料号： MFBW1V2012-301-R ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.0583 | $0.06 |
| 10 | $0.055 | $0.55 |
| 100 | $0.048 | $4.80 |
| 500 | $0.042 | $21.00 |
| 1,000 | $0.038 | $38.00 |
MFBW1V2012-301-R 概述
What is a ferrite bead? A ferrite bead (also called a chip bead, ferrite inductor, or EMI suppression bead) is a passive component that uses ferrite ceramic material to suppress high-frequency noise on power and signal lines. It is placed in series with a conductor where its frequency-dependent impedance — low at DC, high at RF — attenuates EMI/RFI while passing DC and low-frequency signal current virtually unattenuated. In the electronic component hierarchy, ferrite beads sit under Inductors & Coils > Filters in the Passive Components tree and are functionally classified as single-channel EMI filters.
Key features of the MFBW1V2012-301-R include a high 300 Ω impedance at 100 MHz that effectively attenuates conducted emissions above 30 MHz where most digital harmonics and switching-converter noise concentrate, while only dissipating 200 mΩ × 2 A² ≈ 0.8 W of I²R loss at full rated current. The 0805 footprint is one of the most common SMD passive sizes, making the part easy to design in next to ICs, connectors, and DC/DC converters. The multilayer construction is more robust than wire-wound equivalents under thermal cycling and mechanical shock.
Typical applications include DC power-rail decoupling in USB 2.0/3.0 ports, HDMI and DisplayPort lines, switching-converter output filtering, and EMC suppression on microcontroller power pins. The 2 A current rating covers most sub-rail applications including USB VBUS, 3.3 V/5 V logic rails, and PoE phantom feeds. Eaton's datasheet specifies the impedance curve across frequency from 1 MHz to 1 GHz, useful for EMI simulation and filter design.
Design considerations: verify that the maximum DC bias current (2 A) is not exceeded in the application, since impedance drops significantly as bias current approaches saturation. For multi-rail designs, place the bead on each affected rail immediately adjacent to the connector or noise source. The 0805 footprint allows 1 A continuous operation without additional copper thermal management. Compared to a common-mode choke, the MFBW1V2012-301-R is asymmetric — it suppresses only one conductor — but at lower cost and smaller PCB area.
This page synthesizes distributor pricing, family-level parametric data, and practical PCB design guidance that is not found on a single manufacturer datasheet or distributor listing.
直接替换替代料： MFBW1V2012-301-R ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
MFBW1V2012-300-R
✅ 直接替换📋 参考替代料（不在目录中）
MFBW1V2012-302-R
✅ 直接替换📋 参考替代料（不在目录中）
MFBW1V2012-401-R
✅ 直接替换📋 参考替代料（不在目录中）
742792211
✅ 直接替换📋 参考替代料（不在目录中）
MMZ2012S301A
✅ 直接替换📋 参考替代料（不在目录中）
MFBW1V2012-301-R 最大额定值与电气特性
| Impedance @ 100 MHz | 300 Ohms |
| Rated Current (max) | 2.0 A |
| DC Resistance (max, DCR) | 200 mOhm |
| 封装 / 外壳 | 0805 (2012 metric) |
| 安装类型 | Surface Mount |
| 工作温度范围 | -55 °C to +125 °C (ambient plus self-temperature rise) |
| Construction | Multilayer chip ferrite |
| Number of Channels / Lines | 1 |
| RoHS 状态 | Compliant (per Eaton product page) |
| Family | MFBW1V2012 (Eaton high-impedance multilayer ferrite chip bead series) |
| Typical Application | Power-line EMI suppression |
| Data Sheet Document | MFBW1V2012 Chip Bead Data Sheet (Eaton, document reference per datasheet) |
MFBW1V2012-301-R 引脚配置
| 引脚 1 | IN — Input (series with the line to be filtered; one terminal of the chip bead) |
| 引脚 2 | OUT — Output (other terminal of the chip bead; ferritic body between IN and OUT provides high-frequency impedance) |
典型应用
MFBW1V2012-301-R 适用于 7 应用s: USB VBUS EMI Suppression, HDMI / DisplayPort Power-Line Filtering, Switching Converter Output Filtering, Microcontroller / SoC Power-Rail Decoupling, Industrial RS-485 / CAN Bus Power Filtering, PoE Powered Device Supply Filtering, Automotive Infotainment Power Filtering.
USB VBUS EMI Suppression
The MFBW1V2012-301-R is well suited for USB 2.0 and USB 3.0 VBUS power-rail filtering, where its 300 Ω impedance at 100 MHz suppresses high-frequency switching noise from upstream regulators without attenuating the 5 V DC rail. The 2 A current rating comfortably exceeds the USB 3.0 900 mA downstream limit, leaving margin for inrush and BC1.2 charging transients. The 0805 footprint allows placement directly at the USB connector's VBUS pin, minimizing parasitic loop area. Compared with a discrete LC filter, the ferrite bead adds no DC voltage drop beyond 200 mΩ × I_rail, preserving compliance with USB voltage-tolerance specifications.
推荐
HDMI / DisplayPort Power-Line Filtering
The MFBW1V2012-301-R's 300 Ω impedance at 100 MHz effectively attenuates conducted emissions on the HDMI or DisplayPort +5 V power pin, suppressing noise that would otherwise couple into the TMDS/FRL data lines and degrade signal integrity. The 2 A current rating supports the typical HDMI port +5 V 500 mA load plus hot-plug inrush transients. The 0805 footprint fits between the connector and the local +5 V decoupling capacitor, simplifying PCB layout. A single bead per port is usually sufficient for radiated-emissions compliance, with the ferrite's high-frequency loss reducing common-mode noise on adjacent data lines.
推荐
Switching Converter Output Filtering
The MFBW1V2012-301-R placed in series with a DC/DC switching converter output (buck or boost) attenuates the switching ripple and its harmonics that fall in the 30–300 MHz range. The 0805 footprint allows direct integration next to the converter's output inductor and output capacitor, building a compact π-filter (L-C-bead) topology. The 2 A continuous-current rating covers most point-of-load converters up to 10 W at 5 V. The 200 mΩ DCR introduces minimal DC voltage drop (under 1% at 2 A), preserving converter load regulation while improving conducted EMI margins for EN 55022 / FCC Part 15 compliance.
推荐
Microcontroller / SoC Power-Rail Decoupling
On microcontroller and SoC power pins, the MFBW1V2012-301-R blocks high-frequency noise from digital switching activity that would otherwise radiate from the PCB and degrade EMC compliance. The 2 A rating covers typical 3.3 V and 5 V rails for low-power MCUs; for high-current SoCs place one bead per rail segment to isolate analog and digital domains. The 0805 footprint allows placement at the SoC supply pin before the local bulk capacitor, building an effective LC filter. The ferrite's impedance rise above 100 MHz attenuates the highest harmonic content of modern MCUs clocked at 100+ MHz.
推荐
Industrial RS-485 / CAN Bus Power Filtering
The MFBW1V2012-301-R is appropriate for power-line filtering of industrial RS-485, CAN, and Profibus transceivers where conducted emissions must meet EN 61000-6-2/-6-4 industrial EMC standards. The 300 Ω impedance at 100 MHz suppresses common-mode and differential-mode noise on the bus supply while the 2 A rating supports bus-powered nodes. The 0805 footprint allows placement at the transceiver's VCC pin without altering the bus signal path. Operating temperature range of -55 °C to +125 °C covers industrial and outdoor deployments including factory automation and building-control systems.
推荐
PoE Powered Device Supply Filtering
In Power-over-Ethernet (PoE) powered devices, the MFBW1V2012-301-R placed on the rectified PoE supply rail suppresses high-frequency switching noise from the PD controller and downstream DC/DC converters. The 2 A rating covers Class 3 PoE (up to 25.5 W at 51 V) after rectification and filtering. The 0805 footprint fits at the input of the local buck converter that generates the 3.3 V or 5 V load rail. Operating temperature range of -55 °C to +125 °C supports outdoor and industrial PoE deployment including IP cameras, wireless access points, and IoT sensors.
推荐
Automotive Infotainment Power Filtering
The MFBW1V2012-301-R can be used on automotive infotainment and body-electronics power rails where its 300 Ω impedance at 100 MHz attenuates conducted emissions from the many switching converters in modern cars. Although the part is not AEC-Q200 qualified in the verified data, the 0805 footprint and 2 A rating suit body-control, lighting, and infotainment subsystems where conducted EMI must meet CISPR 25. The wide operating temperature range of -55 °C to +125 °C supports under-hood and cabin thermal environments. Place at each supply input to isolated sub-modules to prevent ground-loop noise coupling.
推荐
推荐产品汇总
工程参考数据： MFBW1V2012-301-R ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MFBW1V2012-300-R | MFBW1V2012-302-R | 742792211 | MMZ2012S301A |
|---|---|---|---|---|---|
| Brand | Eaton | Eaton | Eaton | Wurth Elektronik | TDK |
| Package | 0805 (2012 metric) | 0805 (2012 metric) - same | 0805 (2012 metric) - same | 0805 (2012 metric) - same | 0805 (2012 metric) - same |
| Construction | Multilayer chip ferrite | Multilayer chip ferrite | Multilayer chip ferrite | Multilayer chip ferrite (WE-CBF) | Multilayer chip ferrite (MMZ series) |
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Higher impedance than the -300-R sibling, with the same 0805 footprint （对比 MFBW1V2012-300-R)
- Higher current rating than the -302-R sibling （对比 MFBW1V2012-302-R)
- Drop-in pin-compatible 0805 footprint across Eaton MFBW1V2012 family （对比 Wurth 742792211 / TDK MMZ2012S301A)
设计说明
Ferrite bead impedance drops significantly when the DC bias current approaches the rated value. At 2 A the MFBW1V2012-301-R impedance may be reduced by 20–40% compared with the small-signal 100 MHz rating. Leave at least 20% current derating margin in your design — for a 1 A load, choose a 2 A bead like this one, not a 1 A bead — to preserve EMI suppression in worst-case operating conditions.
Place the MFBW1V2012-301-R as close as possible to the noise source (connector or switching converter output) to minimize the high-frequency loop area. Use a continuous ground plane on the layer immediately beneath the bead and avoid routing signal traces under the chip; the 0805 footprint pads should be flooded with copper on top and bottom layers to provide a thermal path for the 0.8 W I²R dissipation at full load.
For differential pairs (USB DP/DM, HDMI TMDS), use a common-mode choke instead of an asymmetric ferrite bead like the MFBW1V2012-301-R. The bead suppresses noise on one conductor only and will unbalance the differential pair. Reserve single-line ferrite beads for power rails (VBUS, +5 V, +3.3 V) where both conductors pass through the same series element.
合规信息
RoHS compliant per Eaton product page and DigiKey listing. AEC-Q100 not applicable for passive components in standard data; AEC-Q200 automotive grade not confirmed in the verified web data. REACH, halogen-free and conflict-minerals status not provided in the verified web data — see _validation_note.
